Improved chuck



and applied to'use a useful Improvement in Chucks for Alow cost, of achuclesimple in its construction and and within the'frcnt section of thecase, slotted to relposition, and an opening ismade in the sideof thecase dnitml mes @www -ws sA MU'E L G.- DARE, or NE wv vonk, N. Y,

Letters Patent No. 85,073, dated December-22, 1858'.

The Schedule referred to in these Letters Patent and making part of thesame. Q-wwf* To all whom it ma/y concern:

Be it known that I, SAMUEL G. DARE, of thc city, county, and State ofNew York, have invented, made,

lathes and other purposes; and I do declare the following to be a full,clear, and correct description of my invention, reference beingl had tothcaccompanyin'g drawings, makingr apart of this specification, and tothe letters of Areference marked thereon, in which- Figure 1 is a rearview'of my improvedlchuck.

Figure 2 is a sectional view of the sa'me.

Figure 3 is a front view of the same. I

in the drawings, like parts ot' the invention are designated by the sameletters of reference.

The natln'e oilmy invention consists in the construction and operation,as more fully hereinafter setforth, of a new and useful chuck for lathesand other purposes. j

-The object of the invention is the production, at a operation.

To enable those skilled in the arts to make and use my invention, I willdescribe its construction and operf ation.

A shows the case oi'my improved chuck, which, in order that access. maybe had to the parts within the. same, may be` made of. two sections,united together by means of screws or in any convenient way.

Withiinthe back section of the'case is inserted a screw, B, havingl uponit a nut, O, provided with a latch,

ceive it, is a ring, D, slotted, as at d, to allow the latch upon thenut O to enter into the same. y

This ring `D is also slottedupon its face, to receive the latches uponthe jaws E, and the front section of the case has out upon its face theradial slots, inwhich the jaws E move freely to andfro as they areoperated,

more fully hereinafter described.

A cap or plateis secured upon the face of the front section of theease,serving to retain the jaws, E in A, for the introduction of asocketfwrench or someA equivalent device, to operate the jaws E, as morefully hereinafter described.

Such being the construction, the' operation is as follows:

The chuck may be secured upon the spindle lath, in any convenientmanner, the jaws E being drawn within tliecase A, as shown -in iig. 3'ofthe drawing. -When desired, to throw out these jaws, a socket wrench, orsome equivalent device, is inserted within the opening in the side ofthe lcase A, so as to fit snugly the head ofthe screw B, upon which 'isthe nut C, lockin g into the rin g D, supporting and governing the jawsE.

As the screw is turned by the wrench, the nut is advanced upon the same,and as it advances it causes theA ring to revolve, by which movement thejaws E ma be thrown out any desired distance from the positiont eyoccupied within the case A.

A reverse movement of thescrew causes the nutto be drawn'back, andthefring following the nut ir its backward movement, the jaws maybedrawnback to their former position.

The jaws move, as it were, from their o'wn.. centres,' Y

and, although separate, move in harmony with each other, while they can,at any time, be instantly removed for repairing, or that their.placesmay be supplied .by

new ones.

The," construction of the chuck, as just described, I allows the use ofa much 'larger central opening than in the ordinary chuck, while, at thesame time, the smallest article to be turned can be readilyy held Withinthe saine.

My invention isalso applicable to the threading of gas-pipe and ofbolts,iu which case the faces of the jaws'should be cut so as to effectthe desired object.

'Having thus'fully described my invention, v l' I claim therein as new,and desire to secure by Letters Patent- The combination, with the case Aand operating ring D of my improved chuck, of the semcircular 'orcrescent-shaped jaws E E E, moving i counterpart recesses or -slotsformed (about independent centres) in said case A, upon circlesintersecting at the centre of the chuck, all substantially as herein setforth.

Witnesses: Y

J. G. GRANGER, A. SIDNEY DoANn.

of the l sAMUnL e. Dane.

